Method and apparatus for improving das signal-to-noise ratio by means of local fk transform

A device for improving DAS signal-to-noise ratio by means of local FK transform, comprising:

• a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor, when executes the computer program, implements the following steps;
• acquiring seismic wavefield data from a DAS acquisition instrument;
• segmenting the seismic wavefield data into a plurality of pieces of local data, each piece of local data having the same dimension as the seismic wavefield data;
• processing each piece of local data through the following steps:
• obtaining an intermediate signal through FK transform, removing partial FK spectral components in the intermediate signal according to scanning energy corresponding to the intermediate signal under different apparent slowness, and performing two-dimensional FFT inverse transform on the intermediate signal with the partial FK spectral components removed;
• and
• combining all processed local data to obtain new seismic wavefield data.

A non-transitory computer readable storage medium, wherein the storage medium stores an instruction, and the instruction, when runs on a computer, enables the computer to execute the following steps:

• acquiring seismic wavefield data from a DAS acquisition instrument;
• segmenting the seismic wavefield data into a plurality of pieces of local data, each piece of local data having the same dimension as the seismic wavefield data;
• processing each piece of local data through the following steps:
• obtaining an intermediate signal through FK transform, removing partial FK spectral components in the intermediate signal according to scanning energy corresponding to the intermediate signal under different apparent slowness, and performing two-dimensional FFT inverse transform on the intermediate signal with the partial FK spectral components removed;
• and
• combining all processed local data to obtain new seismic wavefield data.